传统叶片颤振分析多是基于单转子研究模型，发动机的紧凑性要求导致级间距减小，多排耦合作用对颤振的影响将不容忽视。本文采用自行开发的程序对某型1.5级高压压气机进行了流固耦合数值模拟，分析上、下游叶排对转子叶片颤振特性的影响。针对典型工况，分别进行了单转子模型，导叶转子模型，转子静子模型，导叶转子静子模型的叶片气动弹性稳定性分析。研究表明，激波振荡对颤振特性影响显著；多排环境下存在非定常压力波的反射和叠加，明显改变转子叶片表面的非定常压力幅值和相位，进而改变转子叶片气动弹性稳定性。多排干涉作用提高了转子叶片的气动阻尼，尤其是上、下游叶排同时作用时阻尼提高了近732.7%。
Abstract
Conventional blade flutter analysis is normally based on an isolated blade row model, the influence of multi-row aerodynamic coupling on blade flutter characteristics cant be ignored when rotor-stator gaps decrease due to aeroengine compact requirements. A fluidstructure coupled simulation for a 1.5stage HPC was conducted with a selfdeveloped algorithm to analyze the influence of upstream and downstream blade rows on rotor blade flutter characteristics. Aiming at a typical operation condition, rotor blades aeroelastic stability analyses were performed with an isolated rotor model, an IGV-rotor model, a rotorstator one and an IGV-rotorstator one, respectively. The results showed that the shock wave vibration influences the flutter stability significantly; there are reflection and superposition of unsteady pressure waves under the multirow environment, the amplitude and phase of unsteady pressures on the rotor blade surface are changed obviously and furthermore the blade aeroelastic stability is changed; multirow interferences raise the aerodynamic damping of rotor blade, especially, when the upstream and downstream blade rows act simultaneously, the damping value increases by nearly 732.7%.
关键词
颤振 /
全环多排 /
流固耦合 /
气动阻尼 /
压力波
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Key words
blade flutter;full-Annulus /Multi-Row;fluid-structure interaction;aerodynamic damping /
pressure wave
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